'use strict';

const { Client4 } = require('@mattermost/client');

const { v4: uuidV4 } = require('uuid');

const Logger = require('./logs');

const log = new Logger('Mattermost');

class mattermost {
    constructor(app, mattermostCfg) {
        if (!this.isConfigValid(mattermostCfg)) return;

        this.app = app;
        this.token = mattermostCfg.token;
        this.serverUrl = mattermostCfg.server_url;
        this.username = mattermostCfg.username;
        this.password = mattermostCfg.password;

        this.client = new Client4();
        this.client.setUrl(this.serverUrl);
        this.authenticate();
        this.setupEventHandlers();
    }

    isConfigValid(config) {
        return config.enabled && config.server_url && config.token && config.username && config.password;
    }

    async authenticate() {
        try {
            const user = await this.client.login(this.username, this.password);
            log.debug('--------> Logged into Mattermost as', user.username);
        } catch (error) {
            log.error('Failed to log into Mattermost:', error);
        }
    }

    setupEventHandlers() {
        this.app.post('/mattermost', (req, res) => {
            //
            const { token, text, command, channel_id } = req.body;
            if (token !== this.token) {
                log.error('Invalid token attempt', { token });
                return res.status(403).send('Invalid token');
            }

            if (command.trim() === '/c2c' || text.trim() === '/c2c') {
                const meetingUrl = this.getMeetingURL(req);
                return res.json({
                    text: `Here is your meeting room: ${meetingUrl}`,
                    channel_id: channel_id,
                });
            }

            return res.status(200).send('Command not recognized');
        });
    }

    getMeetingURL(req) {
        const host = req.headers.host;
        const protocol = host.includes('localhost') ? 'http' : 'https';
        return `${protocol}://${host}/?room=${uuidV4()}`;
    }
}

module.exports = mattermost;